Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Which of the following welding discontinuities would be most difficult to imageradiographically:
a. Planar lack of fusion
b. Incomplete penetration
c. Undercut
d. Slag inclusions
Q. The average energy of a Ir-192 source is approximately:
a. 60-80 keV
b. 660 keV
c. 400 keV
d. 1.2 MeV
Q. If the required exposure time for a 50 Curie Ir-192 source is 4 minutes, what exposuretime would be required at 25 Curie source:
a. 4 minutes
b. 8 minutes
c. 2 minutes
d. 16 minutes
Q. Which of the following is not a function of the lead screen placed around radiographic film?
a. Increase the photographic action on the film
b. Selectively absorbs scattered radiation
c. Intensifies effects of the primary radiation beam
d. To mask the test piece
Q. Which of the following is a function of the lead screen placed around radiographic film?
a. Masks the test piece
b. Improves geometric unsharpness
c. Intensifies effects of the primary radiation beam
d. None of the above
Q. What is the best advantage achieved in exposure time, using front and back lead screens, as compared to exposure time without screens?
a. About the same, but less scatter
b. About twice as great, but less scatter
c. 1/2 to 1/3
d. Not related
Q. Gamma ray or high voltage X ray radiography, using film without lead screens, is likelyto result in:
a. Mottling of the film
b. Increased geometric unsharpness
c. No apparent difference, but increased exposure time
d. No apparent difference, but decreased exposure time
Q. An advantage of a double versus a single emulsion film is:
a. It is higher speed
b. It is finer grained
c. It is lower speed
d. None of the above
Q. A radiograph is made using film X with an exposure of 10 mA-min. Film density in the area of interest is 1.0. If it is desired to achieve a density of 2.0 in the area of interest, what exposure is required? (Log relative exposure = 1.1 for a density of 1.0 and 1.62 for a density of 2.0)
a. 41.67 mA-min
b. 10 mA-min
c. 12.6 mA-min
d. 33.1 mA-min
Q. The divergence of an ultrasonic beam is dependant on:
a. Transducer wavelength and diameter
b. Test specimen density
c. The sound wave's angle of incidence
d. The degree of damping of the ultrasonic transducer
Q. When a longitudinal wave is incident upon an inclined interface between zero degreesand the first critical angle:
a. The sound beam is totally reflected
b. Only shear waves are produced in the second material
c. Shear waves and longitudinal waves are produced in the second material
d. Only longitudinal waves are produced in the second material
Q. The piezoelectric material in a search unit which vibrates to produce ultrasonic wavesis called:
a. A backing material
b. A lucite wedge
c. A transducer element or crystal
d. A couplant
Q. When a longitudinal wave is incident upon an inclined interface and is refracted atninety degrees, the angle of the incident longitudinal wave is called:
a. The Snell constant
b. The Snell angle
c. The mode conversion constant
d. The first critical angle
Q. When a longitudinal wave sound beam passes through an acoustic interface at someangle other than zero degrees:
a. Surface waves are generated
b. Plate waves are generated
c. Reflection, refraction and mode conversion will occur
d. The first critical angle is reached